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ACKNOWLEDGEMENTS 
The authors would like to thank to the European Space Agency 
(ESA) for providing the IKONOS image (Earth Observation 
Program, Category 1, ID- 6495). 
J. Pais-Barbosa thanks Funda^ao para a Ciencia e a Tecnologia, 
Portugal, for the financial support (SFRH/BPD/44929/2008).